Why dont blu ray players select the best audio source automatically

[mike4scuba]

Why dont blu ray players select the best audio source automatically
hi i have a sony bdp s350 coupled to a yamaha dsp ax763. i have set the bluray to straight in the audio not mix



why doesnt the player select the best audio source automatically, i will give you an example



i watched batman begins last night and towards the end of the film decided to check the audio source which read dolby digital 5-1, i pressed audio again and this time it selected dolby true hd 5.1



why doesnt it select true hd 5.1 automatically over dolby digital as the better audio source, if this is not possible why dont the disc manufactures list the audio qualities on the disc, in best to worse order then the best quality would be played automatically